[PATCH 12/14] mmc: sh_mmcif: handle chained sglists

Christoph Hellwig
2019-02-12T07:25:26Z

Use the proper sg_next() helper to move to the next scatterlist element
to support chained scatterlists.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/mmc/host/sh_mmcif.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 24c3f13bafdb..9e59dbe6ef30 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -234,7 +234,6 @@ struct sh_mmcif_host {
enum sh_mmcif_wait_for wait_for;
struct delayed_work timeout_work;
size_t blocksize;
- int sg_idx;
int sg_blkidx;
bool power;
bool ccs_enable; /* Command Completion Signal support */
@@ -606,13 +605,13 @@ static bool sh_mmcif_next_block(struct sh_mmcif_host *host)

if (host->sg_blkidx == data->sg->length) {
host->sg_blkidx = 0;
- if (++host->sg_idx < data->sg_len) {
- data->sg++;
- host->pio_offset = data->sg->offset / 4;
- }
+ data->sg = sg_next(data->sg);
+ if (!data->sg)
+ return false;
+ host->pio_offset = data->sg->offset / 4;
}

- return host->sg_idx != data->sg_len;
+ return true;
}

static void sh_mmcif_single_read(struct sh_mmcif_host *host,
@@ -665,7 +664,6 @@ static void sh_mmcif_multi_read(struct sh_mmcif_host *host,
BLOCK_SIZE_MASK;

host->wait_for = MMCIF_WAIT_FOR_MREAD;
- host->sg_idx = 0;
host->sg_blkidx = 0;
host->pio_offset = data->sg->offset / 4;

@@ -752,7 +750,6 @@ static void sh_mmcif_multi_write(struct sh_mmcif_host *host,
BLOCK_SIZE_MASK;

host->wait_for = MMCIF_WAIT_FOR_MWRITE;
- host->sg_idx = 0;
host->sg_blkidx = 0;
host->pio_offset = data->sg->offset / 4;

--
2.20.1